Filament spoolholder (using 20T 6mm idler pulleys)

Filament spool holder for 20T 6mm idler pulleys with bore of 5mm.

The spool in the picture is a 3kg with a diameter of 27cm and a brim width of 7.5mm.

So if you don't have bearing but have a ton of 6mm idler pulleys this might be your solution.
As you can see in the picture your spools brim doesnt have to be thinner than 6mm as the holder has walls that go past the pulleys.

Smallest diameter spool if its brim fits down in the pulley is aprox 19cm.
Smallest if the brim rides like mine